This PR addresses an issue where we could get a stack frame list and
automatically select a stack frame that didn't have a valid path.
Causing a failure on Zed's end to select/update the active debug line.
The fix for this is selecting the first non-subtle stack frame that has
the optional path parameter.
We also made subtle stack frames move into their own collapsable list as
well.
Release Notes:
- debugger: Fix edge case where hitting a breakpoint wouldn't take you
to the active debug line
Co-authored-by: Remco Smits <djsmits12@gmail.com>
